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है”ह”ह

IS 15355 (2003): Rubber Hose and Hose Assemblies forLiquefied Petroleum Gas in Motor Vehicles [PCD 13: Rubberand Rubber Products]

IS 15355:2003ISO 8789:1994

w@’@h?agwJ=RT-fam

Indian Standard

RUBBER HOSE AND HOSE ASSEMBLIESFOR LIQUEFIED PETROLEUM GAS IN MOTOR

VEHICLES — SPECIFICATION

ICS 43.060 .40;83.140.00

0 BIS 2003

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Jf.dy 2003 Price Group 2

Rubber and Rubber Products Sectional Committee, PCD 13

NATIONAL FOREWORD

This Indian Standard is identical with ISO 8789:1994 ‘Rubber hoses and hose assemblies for liquefiedpetroleum gas in motor vehicles — Specification’ issued by the International Organization for Standardization( ISO ) was adopted by the Bureau of Indian Standards on the recommendations of the Rubber andRubber Products Sectional Committee and approval of the Petroleum, Coal and Related Products DivisionCouncil.

The text of ISO Standard has been proposed to be approved as suitable for publication as IndianStandard without deviations. Certain conventions are, however, not identical to those used in IndianStandards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should beread as ‘Indian Standard’.

b) Comma ( , ) has been used as a decimal marker while in Indian Standards, the current practiceis to use a point ( . ) as the decimal marker.

In this adopted standard, reference appears to certain International Standards for which Indian Standardsalso exist. The corresponding Indian Standards which are to be substituted in their place are listedbelow along with their degree of equivalence for the editions indicated. However, that InternationalStandard cross-referred in this adopted ISO Standard which has subsequently been revised, position inrespect of latest ISO Standard has been given:

International Standard Corresponding Indian Standard Degree of Equivalence

ISO 37:1994 Rubber, vulcanized IS 3400 ( Part 1 ) :1987 Methods Technically equivalentor thermoplastic — Determination of test for vulcanized rubber: Part 1 with minor deviationof tensile stress-strain properties Tensile stress-strain properties

( second revision)

ISO 188:1982 Rubber, vulcanized — IS 3400 ( Part 4 ) :1987 Methods doAccelerated ageing or heat- of test for vulcanized rubber: Part 4resistance tests Accelerated ageing ( second

revision )

Iso 471 :1) Rubber — Times, IS 13867 : 1993 Rubber standardtemperatures and humidities for temperatures, humidities and timesconditioning and testing for the conditioning and time interval

between vulcanization and testingof test pieces

ISO 1402 :2) Rubber and plastics IS 443: 1975 Methods of test forhoses and hose assemblies — sampling and test for rubber hosesHydrostatic testing ( second revision)

LSO1817:1985 Rubber, vulcanized — IS 3400 ( Part 6 ) :1983 Methods ofDetermination of the effect of liquids test for vulcanized rubber : Part 6

Resistance to liquids ( firstrevision )

do

do

do

‘1 To be published ( Revision of ISO 471 :1983 and ISO 1826:1981 ).

‘) To be published ( Revision of ISO 1402:1984 ),

( Continued on third cover)

IS 15355:2003

1S0 8789:1994

Indian Standard

RUBBER HOSE AND HOSE ASSEMBLIESFOR LIQUEFIED PETROLEUM GAS IN MOTOR

VEHICLES — SPECIFICATION

1 Scope

This International Standard specifies the requirementsfor rubber hoses and hose assemblies, up to a maxi-mum bore of 20 mm, for use in motor vehicles withliquefied petroleum gas (LPG) installations. The hosesare designed for use up to a maximum pressure of2,5 MPa (25 bar) and a working temperature be-tween – 40 ‘C and + 80 “C.

NOTE 1 If hoses are used at temperatures higher than80 “C, i.e. in an engine compartment and/or as connectinghoses with exhaust-pins (used by air-cooled engines for theevaporation of the gas) it will have to be shown that thesehoses can withstand the higher temperatures.

2

The

Normative references

following standards contain provisions which,through reference in this text, constitute provisionsof this International Standard. At the time of publi-cation, the editions indicated were valid. All standardsare subject to revision, and parties to agreementsbased on this International Standard are encouragedto investigate the possibility of applying the most re-cent editions of the standards indicated below.Members of IEC and ISO maintain registers of cur-rently valid International Standards.

ISO 37:1994, flubber, vu/carrized or thermoplastic —Determination of tensile stress-strain propetiies.

ISO 188:1982, Rubber, vulcanized — Acceleratedageing or heat-resistance tests.

ISO 471 :—11, Rubber — Times, temperatures and hu-midities for conditioning and testing.

ISO 1402:J), Rubber and p/astics hoses and hoseassemblies — Hydrostatic testing.

ISO 1817:1985, Rubber, vulcanized — Determinationof the effect of liquids.

ISO 4080:1991, Rubber and p/astics hoses and hoseassemblies — Determination of permeability to gas.

ISO 4672:1988, Rubber and plastics hoses — Sub-ambient temperature flexibility tests.

ISO 6803:1994, Rubber or p/astics hoses and hoseassemblies — Hydraulic-pressure impulse test with-out flexing.

ISO 7326:1991, Rubber and p/astics hoses — As-sessment of ozone resistance under staticconditions.

3 Bore diameters and tolerances

Bore diameters and tolerances shall comply withrequirements in table 1.

Table 1 — Bore diameters and tolerances

the

Dimensions in millimetres

I Nominal bore ] Tolerances I

6,4 – 0,6 +0,29,5 – 0,6 +0,212,7 – 0,8 +0,415,8 – 0,8 +0,419,0 – 0,8 +0,8

1) To be published. (Revision of ISO 471:1983 and ISO 1826:1981)

2) To be published. (Revision of ISO 1402:1984)

1

IS 15355:2003

ISO 8789: 1994

4 Hose construction

4.1 The hose shall consist of a smooth bore liningand cover of suitable rubber material, reinforced withone or more interlayers.

4.2from

4.3

The cover and lining shall be smooth and freevisible defects and contamination.

If corrosion-resis~ant material (i.e stainless steel)is used for the reinforcement, no cover is required

4.4 Reinforcement may be by cotton, synthetic fibreor corrosion-resistant material (i.e. stainless steel).Reinforcement materials which are not corrosion-resistant will require additional protection against theexternal environment.

NOTE 2 National safety regulations may define the typeof reinforcement to be used.

4.5 To avoid the formation of bubbles due to gaspermeation, the cover shall be pin-pricked.

4.6 The construction of the hose shall be such thatit is not necessary to peel back the cover beforemounting the fitting.

5 Requirements for lining and covermaterial

5.1 Preparation of testpieces

Test pieces shall be taken from theshall be carried out within 24 h afterthe hose.

hose. No testsmanufacture of

5.2 Physical requirements for the lining and

the cover

When tested in accordance with the methods of testindicated in table 2, the lining and the cover shallcomply with the requirements specified.

5.3 Resistance to n-pentane

When tested in accordance with the methods of testindicated in table3, a test piece of the lining andcover, immersed in n-pentane for 72 h at standardtemperature in accordance with ISO 471, shall complywith the requirements specified.

5.4 Ozone resistance

When tested in accordance with ISO 7326:1991,method 3, a test piece of the cover, or complete hosein the case of tubing reinforced with corrosion-resistant material, shall show no visible cracks.

Table 2 — Physical requirements for lining and cover

Property Requirement Method of test

Tensile strength (MPa) 7,0 min. 1s037Elongation at break (Y.) 150 min. 1s037Accelerated ageing: 72 h at 100 ‘C 1s0 188

Change in tensile strength (’Y.) –25 max. 1s0 37Change in elongation at break (%) (-50 to +10) max. 1s037

Table 3 — Resistance to wpentane

Property Requirement Method of test

Change in tensile strength (%) –35 max. 1s0 37

Change in elongation at break (90) –35 max. 1s037Change in volume (Yo) (–10 to +30) max. ISO 1817

2

IS 15355:2003

ISO 8789: 1994

6 Requirements for hoses

6.1 Permeability togas

When tested in accordance with method 3 ofISO 4080:1991, the permeability to propane shall notexceed 0,0528 cm3/m2/s, calculated as permeationthrough the exposed lining area.

6.2 Low-temperature resistance

No cracks or ruptures shall be visible in the cover orlining when tested at – 40 “C in accordance withmethod B of ISO 4672:1988.

6.3 Hydrostatic proof pressure and

minimum burst pressure

6.3.1 The hose shall be designed for a maximumworking pressure of 2,5 MPa (25 bar).

6.3.2 No leaks or signs of failure shall occur when aproof test pressure of 6,25 MPa (62,5 bar) is appliedto the hose in accordance with ISO 1402, except thatthe proof pressure shall be held for a period of10 min.

6.3.3 When tested in accordance with ISO 1402, theminimum burst pressure shall not be less than12,5 MPa (125 bar).

7 Requirements for fittings

7.1 The fittings shall be made of stainless steel,brass or plated ferrous material to prevent corrosion.

7.2 Fittings of the crimp-on type or the screw-together reusable type shall be used. The swivel nutshall be provided with a UNF thread, and sealing shallbe by means of a 45° cone.

NOTE 3 Material specifications and type of fitting maybe affected by national safety regulations.

8 Requirements for hose assemblies

8.1 Impulse testing

8.1.1 After treatment in accordance with 8.1.2, theassembly shall withstand a proof test as described in6.3.2.

8.1.2 Subject the hose assembly to an impulse testin accordance with ISO 6803. The test shall be per-formed with circulating oil at 93 ‘C and at a minimumpressure of 2,5 MPa (25 bar) for 150000 impulses.

8.2 Gastightness

After application, using nitrogen gas, of an internalpressure of 3,0 MPa to the test assembly, the as-sembly shall not show any leak when submerged inwater for 5 min.

9 Marking

9.1 Hoses complying with this International Stan-dard shall be legibly and indelibly marked, at intervalsof not greater than 0,5 m, with the following:

a) the manufacturer’s name or trade-mark;

b) the quarter and year of manufacture;

c) the size and type of hose;

d) the number of this International Standard;

e) the identification “ LPG”.

9.2 Hose assemblies shall bear the name or trade-mark of the assembling manufacturer, and the threadsize.

( Continued from second cover)

International Standard

1S04080 :1991 Rubber and plasticshoses and hose assemblies —Determination of permeability to gas

ISO 4672:1988 Rubber and plasticshoses — Sub-ambient temperatureflexibility tests

ISO 6803:1994 Rubber or plasticshoses and hose assemblies —Hydraulic-pressure impulse testwithout flexing

ISO 7326:1991 Rubber and plasticshoses — Assessment of ozoneresistance under static conditions

Corresponding Indian Standard Degree of Equivalence

Nil —

Nil —

Nil

Nil

—

—

In case of ISO 4080:1991, ISO 4672: 1988, ISO 6803: 1994 and ISO 7326:1991 the Committee,responsible for the preparation of this standard took cognizance of these standards and decided thatthey are acceptable for use in conjunction with this standard.

For tropical countries like India, the standard temperature and the relative humidity shall be takenas 27 * 2°C and 65 * 5 percent respectively.

For the purpose of deciding whether a particular requirement of this standard is complied with, the finalvalue, observed or calculated, expressing the result of a test or analysis, shall be rounded off inaccordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )’. The number ofsignificant places retained in the rounded off value should be the same as that of the specified value inthis standard.

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goods andattending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications maybe reproduced in any form withoutthe prior permission in writing of BIS. This does not preclude the free use, in the course of implementing thestandard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating tocopyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issueof ‘BIS Catalogue’ and ‘Standards : Monthly Additions’.

This Indian Standard has been developed from Doc : No. PCD 13(2103).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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